Frequency

Just like waves in water, sound waves move at a certain speed past a xed point. The frequency of the waves is the number of peaks or troughs which pass this point in one second. The frequency is expressed in hertz (Hz). The higher the number, the lighter the tone and vice versa (treble and bass, respectively).

The frequency range which can normally be heard by humans lies between 20 and 20,000 Hz.

Remember:

The frequency of the waves is the number of peaks or troughs which pass a certain point in one second